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Fits: 2002-2004 BMW 320i 2001-2006 BMW 325Ci 2002-2005 BMW 325i 2001-2006 BMW 330Ci 2001-2005 BMW 330i 2003-2006 BMW M3 2003-2008 BMW Z4 What is an ABS Sensor? The anti-lock braking system uses an ABS sensor or wheel sensor to monitor the wheel speed and send this information to the ABS computer. The ABS computer uses this information to prevent the brakes from locking during an emergency stop. Without ABS, a wheel will automatically lock up in slippery and/or gravel-like conditions, as well as potentially experience a loss of directional control and vehicle stability. Where are these Sensors Located? .
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